125 
also collected on ballast near Philadelphia {^Alart indale'). It may 
be recognized by its branching and rather leafy habit, pinnate leaves 
of 1 or 2 pairs of broadly cimeate-obovate or rhomboidal lobed and 
toothed leaflets. It is much changed by cultivation. 
A. PETKOSEi.iNUM L., the cultivated parsley, a native of the 
Mediterranean region, is reported by J. Donnell Smith from Anne 
Arundel county, Maryland, May 29, 1878; and by Professor 
Macoun, as having become spontaneous in Canada. 
A. REPENS Reich,, a European species, has been found on 
ballast near Philadelphia i^Martindale). 
47. HA RBOURIA.— Glabrous perennials, with 1 to 8 
leaves which are ternately decompound and with narrowly lineal 
or filiform segments, involucre and involucels of few subulate 
bracts, and long-peduncled umbels (mostly in pairs) of yellow 
flowers. 
First collected by Hall <& Harbour, to the latter of whom it is dedi- 
cated, as the name Hallia is preoccupied. 
dl. H. trachypleura. A foot or more high: leaf-segments 
mucronulate: umbels (mostly 2 long-peduncled ones) 15 to 25-rayed ; 
rays an inch long; pedicels 2 to 3 lines long: fruit 2 lines long. 
(Fig. l^^.)—77iaspmm tracJiyfleuriim Gray, Proc. Acad. Philad. 
1863, 63. Cicuta (?) trachypleura Watson, Bibl. Index. Poly pet. 
417. 
In the foot-hills of the mountains of Central Colorado ( Hall <6 Har- 
hour 215, Parry 159, etc., etc.) to New Mexico (JFmdier 277). FI. May, to 
July. 
This plant, as the synomymy shows, has been referred doubtfully to both 
Thaspium and Cicuta,. Its position in Thaspium must have been among 
the so-called “apterous” forms, which we have referred to Zizia, from 
which genus it is plainly separated by its much more prominent corky ribs, 
narrow and prominently corky-thickened commissural face, and whole 
general habit. It is distinct from Cicuta not only in these same characters, 
but also in its more laterally flattened fruit, equal ribs, yellow flowers, and 
habitat. 
48. ALEXES. — An acaulescent glabrous perennial, with 
pinnate leaves, broad sharply toothed or cut rather distant leaflets, 
mostly no involucre, and involucels of lanceolate bractlets about 
equalling the yellow flowers. 
